A researcher wants to see if Alcoholics Anonymous reduces the amount of drinks people consume in...

A researcher wants to see if Alcoholics Anonymous reduces the amount of drinks people consume in a week. Using SPSS and the logic of hypothesis testing, conduct the appropriate test at a .05 significance level.

Before AA	After AA
10	0
9	5
8	2
15	1
9	0
12	2
5	2
4	3
5	1
2	3
5	4
4	2

State your hypotheses.

Using SPSS, determine the characteristics of the comparison distribution.

Determine the cut-off value for a 5% significance level.

Using SPSS, determine the observed t score.

Decide whether or not to reject the null and give a verbal explanation.

Expert Solution

Solution

Since SPSS gives only two tailed significance value so for one tailed we need to divide two tailed significance value by 2 so

The cut-off value for a 5% significance level = 0.001

The observed t score = 3.975

Since the p-value = 0.001 < 5% significance level so we reject the null hypothesis and conclude that the Alcoholics Anonymous reduces the amount of drinks people consume in a week.

orchestra answered 1 year ago

It is claimed by a researcher that the proportion of people who consume Lay's Potato Chips...

It is claimed by a researcher that the proportion of people who consume Lay's Potato Chips is less than the proportion of people who consume Cheetos. Test the claim using α =0.01. The sample data is presented below. Lay's Potato Chips Cheetos X 1 =35 n 1 =80 X 2 =60 n 2 =90 Round all proportions to 2 place values p ^ 1 = p ^ 2 = p ¯= q ¯= State the claim: H 0 p 1=p...

1. There are instances in which a marketing researcher wants to see if there is a...

1. There are instances in which a marketing researcher wants to see if there is a relationship between the responses to one question and the responses to another question in the same survey. Identify the four types of possible relationships. Discuss how they are differentiated.

A researcher wants to test the claim that the mean weight of sugar in cola drinks...

A researcher wants to test the claim that the mean weight of sugar in cola drinks is more today than it was in the past. They tested 49 cans of soda produced last year and found they had a mean weight of sugar of 13.5 g with a standard deviation of 1.2 grams. They also tested 25 cans produced 30 years ago and found they had a mean weight of sugar of 10.1 grams with a standard deviation of 1.6...

Suppose a researcher is collecting data about the amount of soda Americans consume in one day....

Suppose a researcher is collecting data about the amount of soda Americans consume in one day. If the researcher was to gather two separate representative samples from the population, differences may exist between these samples. These differences may be attributed to what?

A researcher wants to examine if practicing yoga reduces stress. She selected a sample of n...

A researcher wants to examine if practicing yoga reduces stress. She selected a sample of n = 30 participants and assessed a stress level of each participant before and after taking a yoga class. The results of the study are tested with a repeated-measures t-test p <.05, 1-tail. What is the alternative hypothesis for this test? A. There is no significant change in stress level after taking yoga class. B. There is a significant significant change in stress level after...

A certain drug induces sleep in 80% of people who consume it. One researcher argues that...

A certain drug induces sleep in 80% of people who consume it. One researcher argues that if it is mixed with another newly developed drug the percentage of effectiveness would be higher. To determine if he is right, he independently selects a random sample of 16 patients and records the number Y of cases in which the mixture induced sleep. The hypotheses for this test are: H_0 ∶p = 0.80 H_a ∶p> 0.80 where p is the proportion of patients...

People consume many liquids besides water: tea, soda, sports drinks, coffee. There is often debate about...

People consume many liquids besides water: tea, soda, sports drinks, coffee. There is often debate about whether these beverages are good hydration, or if they only dehydrate? What does the book have to say on this issue? What factors must be considered when drinking non-water hydrating beverages? Sodium is overabundant in the typical American diet because salt is often added in excessive quantities to processed foods. Find a food label that has an outrageous amount of sodium per serving. Then...

A researcher wants to conduct a test for homogeneity to see if male and female cancer...

A researcher wants to conduct a test for homogeneity to see if male and female cancer patients behave similarly with respect to the types of treatments they select. Use the following data and chooses a 0.10 level of significance. State the null and alternative hypothesis, find test statistic and p-value Male female 76 64 51 62 39 33 10 16

An researcher wishes to see if the primary way people obtain information is independent of their...

An researcher wishes to see if the primary way people obtain information is independent of their highest level of education. A survey of 400 high school and college graduates yielded the following information. At the  = 0.05 significance level, test the claim that the way people obtained information is independent of their education level. - A clear statement of hypotheses - An indication of the test being used - Statement of the test statistic and either p-value (or appropriate...

A researcher is interested in the mean amount of time it takes people to complete a...

A researcher is interested in the mean amount of time it takes people to complete a personality questionnaire. He selects 40 people at random and calculates the mean amount of time to be 20.4 min with a variance of 17.64 min2 . a) Define the parameter of interest. b) Define the random variable of interest. c) Name the distribution required to calculate confidence intervals. (Check the relevant criteria.) d) Construct a 98% confidence interval for the true mean amount of...

Question